starting error with thunderbird 0.7 on woody-system

[Palfalvi Richard <richard.palfalvi@chello.at>]

Hi folks,

I just downloaded the thunderbird-mail-client vers. 0.7,  
installed/moved it with tar -xvzf thu* to my /usr/local/share-directory 
and tried to  start thunderbird in a console-window which failed with 
the following error-message:
"error while loading shared libraries: libgtk-x11-2.0.so.0: cannot open 
shared object file: No such file or directory"

I got the same error-message when I tried to start firefox-0.9 in a 
console-window.

Could somebody tell me what's wrong here and what I have to do? 
Where/how do I get this library? Can I install it on my woody-system 
without any dependency-problems?

Any hints appreciated. Thx a lot.

salut, Richard